CCD photometry of the globular cluster Palomar 5

Journal Article · Tue Apr 01 04:00:00 EST 1986 · Astron. J.; (United States)

DOI:https://doi.org/10.1086/114063· OSTI ID:6061289

Smith, G H; McClure, R D; Stetson, P B; Hesser, J E; Bell, R A

Deep V and B photometry for the outer-halo cluster Palomar 5 (C1513+000) has been obtained with the prime-focus CCD camera at the CTIO 4 m telescope. The color-magnitude diagram reaches several magnitudes below the main-sequence turnoff, the first diagram to be obtained to such faint intrinsic magnitudes for one of the anomalous Palomar clusters. Although this is a sparse cluster, no evidence for a binary sequence was detected like that found by McClure et al. for E3, a halo cluster with similar morphology. The luminosity function on the main sequence shows a turnover like that found for E3, however. This implies a mass function with a very low power-law index, which indicates either that there has been considerable dynamical evolution in the cluster or that the initial mass function had a very peculiar form. The matching of the observed color-magnitude diagram with theoretical isochrones is discussed.

• Research Organization: Dominion Astrophysical Observatory, Herzberg Institute of Astrophysics, 5071 W. Saanich Road, Victoria, British Columbia V8X 4M6, Canada
• OSTI ID: 6061289
• Journal Information: Astron. J.; (United States), Journal Name: Astron. J.; (United States) Vol. 91:4; ISSN ANJOA
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AGE ESTIMATION
COLOR
LUMINOSITY
MASS
MORPHOLOGY
OPTICAL PROPERTIES
ORGANOLEPTIC PROPERTIES
PHOTOMETRY
PHYSICAL PROPERTIES
STAR CLUSTERS